Facial hair that is so sparse it can be considered as good as the fluff on one's bottom
That's not a moustache - that's bum fluff
by Gordon April 02, 2003
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light downy growth of adolescent facial hair; also written bum-fluff or bum fluff

used as an insult, mainly in britain
"Oh listen to me, you antipodean fleck of bumfluff!"

-- House talking with Chase in the Season 2 bloopers of "House M.D."
by House's 2nd Best Friend October 10, 2008
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Any random bits of hair that look like they shouldn't be there or just fluff.
"Look at that mostache its jus bumfluff!"
"You got bumfluff on ya jumpa."
by Emmax x x May 21, 2005
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Bum fluff is literally sparse and whispy facial hairs on an adolescent boy, (Or Asian girl)... Tee hee! Which resemble peach fuzz, under-bed lint, gossimar threads... or any fine downy substance.
"You look a right cunt with that bum fluff on thy face mate! Grow up and stop trying to look like a blonde girl's arse!!!!" * Mr Kipling's Diaries.*
by Spillage66 August 05, 2007
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Ah you're all wrong it aint on your arse it's on your face....god
hey you might wanna shave that bum fluff
by MaHe November 27, 2003
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When an adolescent boy first grows facial hair it looks all wispy and yucky. This hair resembles the fluffy hair on some people's bums. So shave it off or you can look ridiculous. Girls really hate it. I'm a girl!

So shave it off and get a REAL beard started!
Once I was up close to my big brother's friend. He had heaps of Bum Fluff on his face which made me want to PUKE!

by fclb September 23, 2005
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